ˈnīgrəˌsēn, -_sə̇n noun
also ni·gro·sin -_sə̇n
( -s )
Usage: often capitalized
Etymology: Latin nigr-, niger black + English -ose + -ine or -in
: any of several azine dyes closely related to the indulines: as
a. or nigrosine base B usually capitalized N & both Bs : an oil-soluble bluish black dye obtained as the free base by heating aniline and aniline hydrochloride and nitrobenzene or nitrophenol in the presence of iron and used chiefly in coloring waxes, shoe polish, plastics, and lacquers and as wood stains — see dye table I (under Solvent Black 7 )
b. or nigrosine spirit soluble usually capitalized N & both Ss : a chloride of the free base that is soluble in alcohol and is used similarly — see dye table I (under Solvent Black 5 )
c. or nigrosine water soluble usually capitalized N&W&S : a water-soluble sulfonation product of the free base or of its chloride used chiefly in dyeing leather and paper and as a biological stain — see dye table I (under Acid Black 2 )